289

 Appendix Table B-I summarizes the mean and amplitude

values used for the different tests, relates them to real-

world maximum, minimum, and mean acreages, and shows which

model or models were used to test ecosystem response to

each condition. Each condition is assigned an alphabetic

character which corresponds to the letters on the depth-

area (hypsographic) curve for the study region in Figure 70

(this is the same curve as Figure 22 in the Results

section). The brackets in Figure 70 indicate maximum,

minimum, and range approximations for each condition of

drainage. The ratio of depth-range to range-of-surface-

water-area increases abruptly as conditions become more

drained, as indicated by the increase in the slope of the

curve.

 Figure 71 shows analog plots of seasonal variation in

the two forcing functions, solar radiation and surface

water area, and their product, under present conditions for

a repeating five year period. Also in Figure 71 are

simulations from Model I and II showing the response of

four ecosystem parameters: fish biomass, fish density,

bird biomass, and bird number, to the seasonally changing

forcing functions. Fluctuations in values for all four

parameters have the same frequency, but there is a phase

lag of about 0.5 mo between the seasonal oscillation in

fish biomass and that of fish density and bird biomass,

which are in phase with each other; and a phase lag of

about 1 mo between fish biomass and bird number. The